Boat EconomicsKeep, Repair, Upgrade, Resale, and Review
Does Upgrading Actually Solve a Real Problem, at What Cost?
Compare keeping your current boat against a candidate upgrade, tied to the specific use problem the upgrade is meant to solve, not a generic "is it time to upgrade" score.
"Is it time to upgrade" is the wrong question
A boat that still runs fine doesn't need an upgrade just because a newer one exists. The real question is whether a specific upgrade solves a specific problem, not enough cabin space, not enough range, outgrowing the current layout, at a cost that's worth paying. This engine requires naming that problem before it will offer a recommendation, so the cost comparison never gets mistaken for permission to upgrade without a real reason.
How this is calculated
Keeping totals your current boat's recurring cost over the horizon, minus what you expect it to be worth at the end. Upgrading nets out what selling your current boat brings in (after transaction costs) against the candidate's acquisition cost, then adds the candidate's own recurring cost and subtracts its resale. The gap between the two is the cost of upgrading, positive or negative, regardless of whether a use problem was named.
Worked example
A current boat worth $18,000 today, $3,000 a year to run, expected to be worth $8,000 in five years, costs $7,000 to keep over that horizon. A $35,000 candidate, after netting $17,500 from selling the current boat (minus $500 in transaction costs), plus its own $3,000 a year in recurring cost, minus a $20,000 expected resale, costs $12,500 to upgrade to. That's $5,500 more than keeping; the candidate would need to be priced near $29,500 for the two to tie.
Common mistakes
Running this comparison and treating a lower upgrade cost as automatic permission to upgrade skips the actual point, the upgrade still needs to solve something real. The opposite mistake, upgrading anyway despite a higher cost with no named use gap, is exactly what the withheld recommendation is meant to flag.
Frequently asked questions
Why does this need a stated use problem before giving a recommendation?
Because an upgrade that costs more only makes sense against something specific it improves, more cabin space, better fuel range, a layout that fits your family now. Without naming that, a lower or higher cost number has nothing real to be weighed against, so this engine withholds the recommendation rather than imply one anyway.
Is the cost comparison still useful without naming a use problem?
Yes, the full cost delta between keeping and upgrading is always shown. What's withheld is only the recommendation itself, since a bare cost number can't tell you whether paying more is worth it for reasons the math can't see.
How is this different from Repair vs Replace Boat?
That engine centers on a known repair cost forcing a keep-or-replace decision. This one is for a serviceable boat with no forcing repair, where the question is purely whether a specific upgrade is worth its cost.
What if I'm not sure what my current boat would sell for?
Use a conservative estimate from recent comparable listings. Since it reduces the effective cost of upgrading, an optimistic number will make upgrading look better than it may actually be.